Patchamus Crime

hi am aware of the stickys

but still a tad confused

car is modified escort with efi approx 200+

has been run on 5w40 comma fully synthetic oil from rebuild by previous owner done maybe 5-10k since full engine rebuild

should i stick with this oil or go with something a little thicker only been running it in summer months if you can call it summer apr-oct

posted on a few fb pages and was told 10w40 but when i search for that all i find is m/c oil

any advice please

beller

Would definitely ditch the comma stuff mate, used to use it but was advised to use Millers cfs competition fully synth 10/40 for my standard erst.

I know your running a lot more hp than mine but I think the comma stuff isnt great for our old turbo engines

haz87

5w40 is far too thin for a cvh really. 10w/40 at the VERY minimum, 15w40 being the normal start point for most owners

Chas

I thought with CVHs it was the thicker oils combined with a lack of oil changes that finished the camshafts off back in the day (my dad's XR3i ran fine until 150k when it was sold with 10W40 and 5W40), when synthetic oils were significantly pricier than cheapo multigrades including 15W40 and 20W50 and where an engine like a Crossflow or BMC A-Series could go on with the odd oil change skipped in the short term.

I am happy to be corrected here though .

However, I'd be tempted to run a 10W40 or even a 10W50 Fully synthetic depending on if the car is used on track in this application.

Canada1

I do not agree with this statement at all.

5w40 will be thin at low temperatures (which one wants). It will be a similar viscosity at 100C to 15w40.
I am sure temperatures in the UK get near 0 C. I would not want to start an engine at 0C with 15w40.

In the hot summer (if there is such a thing in the UK) 15w40 would work fine.
In any case, at operating temperature of the engine at 100C or close, 5w40 or 15w40 will have the same viscosity. One just provides better cold start up protection.

When I was road racing with the Cosworth 3 liter Pontiac IMSA engines we ran 20w50. Even on hot days we preheated the oil with a plug in heater before we ran the engine.

Patchamus Crime

Ok i did another google search and come across an oil specialist saying about silkolene (fuchs) race pro s 10w50 fully synthetic so i bought some of that £55 for 5 liters but cant put a price on an engine.

Thanks for the replies

Karlos G

iTrader: (4)

Perry is 100% correct, the first rating is the cold viscosity (winter hence the 'W') and the later it's viscosity at 100C, so 5w/40 10w/40 and 15w/40 are all the same once up to temp, but the 5w will circulate better from cold.
That is a good choice of oil.

mentalasanything

Same as I run, it's pricy but it's a good oil.

I bet it was Opie oils recommending it, they are a fan of it!

Lee